New Product: Aluminum Flywheels with and w/o timing gear
07-03-2007, 10:33 PM
#1
Developer
Thread Starter
New Product: Aluminum Flywheels with and w/o timing gear
I had an aluminum flywheel made for me some 3+ years ago and have enjoyed it very much. The difference in engine acceleration is very noticable.
This last winter, while I had the engine out, I removed the flywheel and sent it in to be dimensioned and improved - I wanted to make it the exact size needed to press-fit the ignition timing gear for the later 928's. Done.
These are now C&C milled from a billet and balanced. They are professionally made, and hold a timing gear well. After 3 years of racing with a very agressive GT1 clutch pack - I still have no wear or reason to replace the steel insert - but its good to know that the steel insert is replaceable should the need arise instead of replacing the whole flywheel.
I have only 6 of them in stock right now; 4 with timing gears for '83 to 95 928 fitted with dual-disk clutches, and 2 without timing gears for early cars '78 to '82.
Price without timing gear: $429
Price with timing gear installed: $529
As racers tend to upgrade from single-disk clutches to dual-disk clutches, I did not make any for the single disk clutch setup.
More detailed info and bigger pictures can be seen here:
http://www.928motorsports.com/parts/...umflywheel.php
Thank you for looking, and for your love of the 928.
This last winter, while I had the engine out, I removed the flywheel and sent it in to be dimensioned and improved - I wanted to make it the exact size needed to press-fit the ignition timing gear for the later 928's. Done.
These are now C&C milled from a billet and balanced. They are professionally made, and hold a timing gear well. After 3 years of racing with a very agressive GT1 clutch pack - I still have no wear or reason to replace the steel insert - but its good to know that the steel insert is replaceable should the need arise instead of replacing the whole flywheel.
I have only 6 of them in stock right now; 4 with timing gears for '83 to 95 928 fitted with dual-disk clutches, and 2 without timing gears for early cars '78 to '82.
Price without timing gear: $429
Price with timing gear installed: $529
As racers tend to upgrade from single-disk clutches to dual-disk clutches, I did not make any for the single disk clutch setup.
More detailed info and bigger pictures can be seen here:
http://www.928motorsports.com/parts/...umflywheel.php
Thank you for looking, and for your love of the 928.
07-03-2007, 10:44 PM
#2
What are you "levels" in seriousness of clutch plates? How far did the stock Dual disk get you power wise?
A good current example is Louie or Jim R, as they have mucho power-o.
A good current example is Louie or Jim R, as they have mucho power-o.
07-03-2007, 11:36 PM
#4
Developer
Thread Starter
What are you "levels" in seriousness of clutch plates?
They are all listed here:
www.928clutch.com
As far as what do the stock clutches hold... we have found that the very early 78 and 79 clutches cannot hold our Stage 1 SC kit. No surprise there - they could barekly hold thge stock 220 HP if driven hard, thats why Porsche increased the clamping force by 1981 on the dual-disk clutches.
We find that a '81-83 dual disk clutch driven correctly works with no problems on our Stage 1 and Stage 2 SC kits.
07-03-2007, 11:49 PM
#6
Rennlist Member
what is the weight difference. what is the advantage over the stock steel set up. do those holes reduced the "contact" patch of the clutch or increase wear on that first clutch disc?
mk
mk
07-04-2007, 12:20 AM
#7
Drifting
Join Date: Jul 2006
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Hey Carl, it looks sweat!
But at half the weight - what’s the idle like? I've been told that lighter fly wheels can cause unstable idle. This could be an issue for us living in states (like the smog ****’s in Kalifornia) with strict emissions testing?
But at half the weight - what’s the idle like? I've been told that lighter fly wheels can cause unstable idle. This could be an issue for us living in states (like the smog ****’s in Kalifornia) with strict emissions testing?
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07-04-2007, 01:16 AM
#8
Developer
Thread Starter
what is the weight difference. what is the advantage over the stock steel set up. do those holes reduced the "contact" patch of the clutch or increase wear on that first clutch disc?
The idle will be the same, no different.
What IS different is that you will need to be a little better with the clutch from a standing start as the flywheel now stores less inertia. Rev a wee bit higher, let it out a tad smoother. That's all.
As to the "holes" - think of drilled brake rotors. The drilling allows the gas created by the hot friction material to escape so the friction material does not "float" above the disk on gas when hot. Same thing here. In creases the surface pressure per sq inch too.
07-04-2007, 01:56 AM
#9
Burning Brakes
O' sure just one more little tid bit to make me wish i could drive a stick 
..."We can make it faster, stronger ,quicker..We can make it better...O' wait you have an auto....well we do have a supercharger!! "
..."We can make it faster, stronger ,quicker..We can make it better...O' wait you have an auto....well we do have a supercharger!! "
07-04-2007, 10:51 AM
#12
Developer
Thread Starter
John - good catch! The Inner Diameter of all the timing gears are the same. Our flywheel will accept either gear. Good catch tho - I will re-list them so the 100 tooth gear and the 60 tooth gear are listed separately.
07-04-2007, 12:12 PM
#15
Rennlist Member
Originally Posted by Carl Fausett
John - good catch! The Inner Diameter of all the timing gears are the same. Our flywheel will accept either gear. Good catch tho - I will re-list them so the 100 tooth gear and the 60 tooth gear are listed separately.